Does anyone here swim for fitness or weight loss? Due to the size of my boobs running is very painful for me, so I've always had trouble finding a cardio workout. But lately I've taken up swimming and love it. It seems to be an ideal exercise since it works out your entire body but is low impact on your joints etc unlike running. The only problem is I get bored just doing laps over and over again and because of that usually don't swim for a long time. I wish I had one of those underwater MP3 players.